Serilog Email Sink多收件人配置失败求助（ASP.NET Core 6.1）

开发基于ASP.NET Core 6.1的后台工作服务，使用Serilog Email Sink 2.4时，配置向多个收件人发送邮件失败：既无错误提示，也收不到邮件，但单个收件人时功能正常。已尝试多种分隔符格式，均无效，寻求解决办法。

当前配置代码如下：

{
        "Name": "CustomEmail",
        "Args": {
          "ConnectionInfo": {
            "NetworkCredentials": {
              "UserName": "support@support.com",
              "Password": "1234"
            },
            "FromEmail": "support@support.com",
            "MailServer": "smtp.gmail.com",
            "EmailSubject": "[{Level}] Multiple Requests",
            "Port": "465",
            "IsBodyHtml": false,
            "EnableSsl": true,
            "ToEmail": "to1@gmail.com; to2@gmail.com",
            "RestrictedToMinimumLevel": "Error",
            "OutputTemplate": "{Timestamp:yyyy-MM-dd HH:mm} [{Level}] {Message}{NewLine}{Exception}"
          }
        }
      }

已尝试的ToEmail格式：

• "ToEmail": "to1@gmail.com; to2@gmail.com"
• "ToEmail": "to1@gmail.com;to2@gmail.com"
• "ToEmail": "to1@gmail.com, to2@gmail.com"
• "ToEmail": "to1@gmail.com,to2@gmail.com"

解决办法 #

Serilog Email Sink 2.4的ToEmail字段不支持直接用分隔符填写多个收件人，需通过代码配置实现多收件人功能：

1. 代码直接配置Sink
   在Program.cs中手动初始化Logger时，传入多收件人数组：

Log.Logger = new LoggerConfiguration()
    .ReadFrom.Configuration(Configuration)
    .WriteTo.Email(
        connectionInfo: new EmailConnectionInfo
        {
            FromEmail = "support@support.com",
            MailServer = "smtp.gmail.com",
            Port = 465,
            EnableSsl = true,
            NetworkCredentials = new NetworkCredential("support@support.com", "1234"),
            EmailSubject = "[{Level}] Multiple Requests",
            IsBodyHtml = false,
            OutputTemplate = "{Timestamp:yyyy-MM-dd HH:mm} [{Level}] {Message}{NewLine}{Exception}"
        },
        toEmailAddresses: new[] { "to1@gmail.com", "to2@gmail.com" }
    )
    .CreateLogger();

2. 结合JSON配置扩展
   若希望保留JSON中的基础配置，仅在代码中覆盖收件人参数：

var emailConfig = Configuration.GetSection("Serilog:WriteTo:0:Args:ConnectionInfo").Get<EmailConnectionInfo>();
Log.Logger = new LoggerConfiguration()
    .ReadFrom.Configuration(Configuration)
    .WriteTo.Email(
        connectionInfo: emailConfig,
        toEmailAddresses: new[] { "to1@gmail.com", "to2@gmail.com" }
    )
    .CreateLogger();

3. SMTP服务验证
   确认Gmail SMTP服务未限制收件人数量，同时检查发件账号的安全设置：若启用了两步验证，需使用应用专用密码替代原账号密码；若未启用两步验证，需开启低安全性应用访问权限。

内容的提问来源于stack exchange，提问作者raysefo